Question

Heart in human is ________chambered. It prevents mixing of _________ and
___________ blood. This helps in a better and efficient respiration in the organisms
this provides more energy required to keep their body warm. Such organisms are
called__________ . The blood flows into the heart twice from the heart to the lungs
and back to the heart which is called as _________ and from the heart to different
parts of the body and then once again to the heart this is called __________.
Together they are termed as ____________.

Answer 1

Answer:

A) four

B) oxygenated

C) deoxygenated

D) mameals and birds

E) dubbal circulation

F) Infurior Vena Cava

G) The work of heart